Throw error when missing required subject parameter

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 62.04%. Comparing base (c8d5317) to head (f4b8554).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #476 +/- ## ============================================ + Coverage 62.02% 62.04% +0.01% - Complexity 3558 3561 +3 ============================================ Files 328 328 Lines 17603 17609 +6 Branches 2715 2715 ============================================ + Hits 10919 10925 +6 Misses 5472 5472 Partials 1212 1212 ```

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